The present invention relates to novel organic electroluminescent compounds, and organic electroluminescent devices employing the same in an electroluminescent layer. The method can include the step of positioning a plurality of acupuncture needles coupled to the electrical stimulator at specific acupuncture points. The screw shaft is encapsulated within a housing including a hopper portion, transition portion, bearing portion and screen portion. Accordingly, an efficiency of reproducing the sound source in a low frequency band as well as a high frequency band is superior, and a realistic three-dimensional sound system can be implemented.